531212136 has 96 divisors (see below), whose sum is σ = 1663734240. Its totient is φ = 140095872.

The previous prime is 531212069. The next prime is 531212147. The reversal of 531212136 is 631212135.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2086 + ... + 32661.

It is an arithmetic number, because the mean of its divisors is an integer number (17330565).

Almost surely, 2^531212136 is an apocalyptic number.

531212136 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531212136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831867120).

531212136 is an abundant number, since it is smaller than the sum of its proper divisors (1132522104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531212136 is a wasteful number, since it uses less digits than its factorization.

531212136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34783 (or 34772 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 531212136 is about 23048.0397431105. The cubic root of 531212136 is about 809.8837083467.

Subtracting 531212136 from its reverse (631212135), we obtain a palindrome (99999999).

The spelling of 531212136 in words is "five hundred thirty-one million, two hundred twelve thousand, one hundred thirty-six".